Homie.isConfigured() now check only if valid (not load json) (#721)
Homie.isConfigured() now check only if valid (not load json) (#721)

Avoid loading config each time want check if configured (calling isConfigured()).

Fix: Remove the spam message "/homie/config.json doesn't exist" in config mode, when put isConfigured() in loop().
marvinroger/homie-esp8266,marvinroger/homie-esp8266,marvinroger/homie-esp8266,marvinroger/homie-esp8266